> I guess 386 could live with an exception handler that emulates it.

386 could use a simpler setup and is non SMP

> (BTW an generic exception handler for CMPXCHG would also be very useful
> for glibc -- currently it has special checking code for 386 in its mutexes) 
> The 386 are so slow that nobody would probably notice a bit more slowness
> by a few exceptions.

Be serious. You can compile glibc without 386 support. Most vendors already
distribute 386/586 or 386/686 glibc sets.

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